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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory [Line Items]    
Raw materials and work-in-progress $ 366.1 $ 319.7
Finished goods 78.6 89.6
Gross inventories 444.7 409.3
Inventory valuation reserves (18.3) (17.3)
Inventories, net $ 426.4 $ 392.0